Il A heavy ball with a weicht of 100 N (m 10.2 kg) is hung. from the ceiling of a lecture hall on a 4.5-m-long rope. The ball. is pulled to one side and released to swing as a pendulum, reach-. ing a speed of 5.5 m/s as it passes throuoh the lowest point.
Inventions. The huochong gun was invented in China during the Ming dynasty. It was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.t was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.
Firelance: Invented during the Tang dynasty, it was the flamethrower of their generation. Using gunpowder, it shot a mixture of fire and projectiles up to 40 yards. Grand Canal: Completed by Sui Yangdi during the Sui dynasty, it was built to link the Huang He and Chang Jiang rivers and made it easier to ship rice from the south to the north.